


Politecnico di Torino  
Academic Year 2012/13  
17AULMK, 17AULLS Introduction to electrical engineering/Electrical machines 

1st degree and Bachelorlevel of the Bologna process in Energy Engineering  Torino 1st degree and Bachelorlevel of the Bologna process in Material Engineering  Torino 





Subject fundamentals
The course aims to introduce the main concepts of the analysis circuit of the electric and magnetic phenomena, with particular attention to aspects of DC and low frequency. In the first part will be given the methodological bases for understanding the working principles and key operational concepts of electromechanical equipment and in general a rational, proper and safe operation of electrical equipment. The course aims to provide students with the tools to evaluate the performance of the main electrical machinery, in view of their application in industrial processes. In particular, it intends to condition the student to understand the principles of operation and can be treated, from the user point of view, the electric machines. 
Expected learning outcomes
Master the key concepts circuit analysis, quantitative assessments of ability to perform simple electrical circuits industry, understand usage patterns and the main fields of application of electrical machinery and know how to cope with simple numerical exercises on the main types of electric machines.

Prerequisites / Assumed knowledge
The course considers the concepts acquired in ordinary differential equations, complex numbers and the basic concepts of electromagnetism.

Contents
1. Circuit Analysis of electromagnetic phenomena: electrical circuits as a model of physical phenomena, the concept of port, the electrical voltage, current and power units and measuring instruments, brief to the topology of the circuits, Kirchhoff's laws, basic assumptions of the model circuit . 2. Adynamic Circuits: constitutive equations of an ideal resistor, voltage and current generators ideal, short circuit and open circuit, connected in series and parallelports, the special case of series and parallel resistors, voltage divider and current transformations stellatriangolo and vice versa., nonideal components. Power and energy in the circuits. 3. Methods for the solution of adynamic generic circuits: algebraic method for solving circuits adynamic. Network theorems (superposition theorem, circ. Thevenin and Norton equivalent, Millmann, Tellegen's theorem) 4. Elementary components and dynamic circuits: dynamic components: capacitors, inductors, coupled inductors and ideal transformer. State variables. RC and RL transient circuits of the first order. Concept of transitional arrangements and in linear networks 5. Circuits in sinusoidal steady state: phasor method, symbolic, Kirchhoff's laws and constitutive equations in the frequency domain, impedance and admittance of the ports. Sinusoidal power, active power, reactive and complex. Boucherot theorem for power, power factor correction. 6. Threephase system: threephase system, definitions, generators and three phase loads, star and delta connections, methods of solutionphase circuits, symmetrical and balanced. Threephase power circuits and its measure. 7. Introduction to Electrical Safety: Surge in plants, overload, short circuit and thermal magnetic circuit breaker, electrical safety of persons, the effects of electricity on people, GFCI. 8. Introduction to the electromechanical energy conversion. Magnetic Materials: classification, the phenomenon of magnetic hysteresis and nonlinearity. Elements of electromagnetics: steady or slowly varying magnetic field, magnetic circuits, the concept of reluctance, inductance and mutual inductance, energy in magnetic circuits, electromotive force, iron losses. Heating of electrical machines. 9. DC electric machine: aspects of construction, operating principle, equations of the machine, excitation type: independent, series and shunt, performance, mechanical, performance, speed control and starting torque, and hints on switching on the armature reaction. 10. Transformer: construction aspects, an ideal singlephase transformer, principle of operation and equivalent circuit of the real transformer, load test and short circuit, determination of machine parameters, efficiency, voltage drop industrial parallel transformers, auto transformer, transformer phase. 11. Induction motor: construction aspects, the principle of rotating magnetic field of Galileo Ferraris, equivalent circuit, load tests and short circuit, mechanical characteristics, wound rotor and squirrel cage rotor, speed control, singlephase induction motor. 12. Synchronous machines: construction aspects, signs on the alternator connected to the network of dominant power, synchronous reactance. Types of synchronous motors. 
Texts, readings, handouts and other learning resources
C.A. Desoer, E.S. Kuh, Fondamenti di teoria dei circuiti, Franco Angeli editore, MIlano
A. Fitzgerald, C. Kingsley, A. Kusko, Macchine Elettriche, Franco Angeli Editore 
Assessment and grading criteria
Written and oral examination

